See http://stackoverflow.com/questions/43081051/broad-crawling-different-xpaths-scrapy Similar to #399 where we set a max depth per URL but this time we'd have a xpath expression like in the [XpathFilter](https://github.com/DigitalPebble/storm-crawler/blob/master/core/src/main/java/com/digitalpebble/stormcrawler/parse/filter/XPathFilter.java)
See http://stackoverflow.com/questions/43081051/broad-crawling-different-xpaths-scrapy
Similar to #399 where we set a max depth per URL but this time we'd have a xpath expression like in the XpathFilter